21000340881

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{157}}^1\times {\mathrm{647}}^1$

素因数の和:876

約数の個数: 128

約数和(自身を含む): 36694425600

約数和(自身を除く): 15694084719

約数列:

[1, 3, 9, 13, 19, 27, 31, 39, 57, 93, 117, 157, 171, 247, 279, 351, 403, 471, 513, 589, 647, 741, 837, 1209, 1413, 1767, 1941, 2041, 2223, 2983, 3627, 4239, 4867, 5301, 5823, 6123, 6669, 7657, 8411, 8949, 10881, 12293, 14601, 15903, 17469, 18369, 20057, 22971, 25233, 26847, 36879, 38779, 43803, 55107, 60171, 63271, 68913, 75699, 80541, 92473, 101579, 110637, 116337, 131409, 159809, 180513, 189813, 206739, 227097, 260741, 277419, 304737, 331911, 349011, 381083, 479427, 541539, 569439, 782223, 832257, 914211, 1047033, 1143249, 1202149, 1320527, 1438281, 1708317, 1930001, 2346669, 2496771, 2742633, 3148949, 3429747, 3606447, 3961581, 4314843, 4954079, 5790003, 7040007, 9446847, 10289241, 10819341, 11884743, 14862237, 17370009, 25090013, 28340541, 32458023, 35654229, 40936337, 44586711, 52110027, 59830031, 75270039, 85021623, 122809011, 133760133, 179490093, 225810117, 368427033, 538470279, 677430351, 777790403, 1105281099, 1615410837, 2333371209, 7000113627, 21000340881]

約数ペア:

[(1, 21000340881), (3, 7000113627), (9, 2333371209), (13, 1615410837), (19, 1105281099), (27, 777790403), (31, 677430351), (39, 538470279), (57, 368427033), (93, 225810117), (117, 179490093), (157, 133760133), (171, 122809011), (247, 85021623), (279, 75270039), (351, 59830031), (403, 52110027), (471, 44586711), (513, 40936337), (589, 35654229), (647, 32458023), (741, 28340541), (837, 25090013), (1209, 17370009), (1413, 14862237), (1767, 11884743), (1941, 10819341), (2041, 10289241), (2223, 9446847), (2983, 7040007), (3627, 5790003), (4239, 4954079), (4867, 4314843), (5301, 3961581), (5823, 3606447), (6123, 3429747), (6669, 3148949), (7657, 2742633), (8411, 2496771), (8949, 2346669), (10881, 1930001), (12293, 1708317), (14601, 1438281), (15903, 1320527), (17469, 1202149), (18369, 1143249), (20057, 1047033), (22971, 914211), (25233, 832257), (26847, 782223), (36879, 569439), (38779, 541539), (43803, 479427), (55107, 381083), (60171, 349011), (63271, 331911), (68913, 304737), (75699, 277419), (80541, 260741), (92473, 227097), (101579, 206739), (110637, 189813), (116337, 180513), (131409, 159809)]